L. F. Silva

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This paper reports and describes the diverse stages concerning the development of an unmanned aerial vehicle (UAV) named "Aeronave Inteligente com Visao Artificial", better known by its acronym as AIVA. The design and development of the first aerial platform, the onboard communications, the instrumentation system, the bidirectional communications platform(More)
This paper presents the framework of an interface between wireless sensor networks and personal devices like PDAs, cellular phones and laptops. It possesses a flexible architecture that can be adapted easily to display any kind of data received from the network sensors using content description. The most relevant properties of this system are: portability(More)
Industrial sewing machines have been significantly improved in recent years and especially electronic sewing control is now being introduced. This study concerns the development of a controller for an electromagnetically actuated presser foot. The controller is responsible for controlling the vertical movement of the presser foot. This is an important point(More)
Skylab multispectral scanner data, digitized Skylab color infrared (IR) photography, digitized Skylab black and white multiband photography, and Earth Resources Technology Satellite (ERTS) multi-spectral scanner data collected within a 24-h time period over an area in south-central Indiana near Bloomington on June 9 and 10, 1973, were compared in a(More)
Volatile compounds produced during the processing stages of Paínho de Portalegre, a portuguese traditional dry fermented sausage, were extracted and analyzed by a purge and trap gas chromatography flame ionization detector system (PT/GC/FID). A total of fourty five volatile compounds were detected, which included aldehydes (13), ketones (12), alcohols (9),(More)
The industrial manufacturing of sewn products has always been one of the critical processes of the textile chain concerning quality assurance. Assuring the appropriate set-up and operation of all the machines, and thus the final seam quality, is a very complex task. Traditionally, this task is accomplished by empirical methods, with machine setting and(More)
Ultrathin sections of microfilariae of Wuchereria bancrofti embedded in hydrophilic resin were incubated with sera from patients, using antisera from asymptomatic microfilaremic patients with different microfilarial densities [1–100 microfilariae (mf)/ml, 101–500 mf/ml, >1,000 mf/ml]. All groups studied showed reactivity against relevant epitopes in all(More)
In the present paper, we report the results we obtained using several cytochemical techniques to analyze the infective larva of Wuchereria bancrofti. An imidazole osmium tetroxide solution was used to visualize unsaturated fatty acids. A highly contrasted material forming a continuous structure was observed on the larval surface and over the epicuticle. A(More)
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